Bisphenol-A and diethylstilbestrol exposure induces the expression of breast cancer associated long noncoding RNA HOTAIR in vitro and in vivo.

Bisphenol-A and diethylstilbestrol exposure induces the expression of breast cancer associated long noncoding RNA HOTAIR in vitro and in vivo.
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DOI:
10.1016/j.jsbmb.2014.02.002
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发表时间:
2014-05
影响因子:
4.1
通讯作者:
Mandal, Subhrangsu S.
Mandal, Subhrangsu S.
中科院分区:
生物学2区
文献类型:
--
作者:
Bhan, Arunoday;Hussain, Imran;Ansari, Khairul I.;Bobzean, Samara A. M.;Perrotti, Linda I.;Mandal, Subhrangsu S.

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反义转录本,长链非编码 RNA HOTAIR 是基因沉默和乳腺癌的关键参与者,并受雌二醇转录调节。在这里,我们研究了 HOTAIR 表达是否受到双酚 A (BPA) 和己烯雌酚 (DES) 的错误调节。我们的研究结果表明,BPA 和 DES 在培养的人乳腺癌细胞 (MCF7) 以及体内大鼠乳腺中诱导 HOTAIR 表达。荧光素酶测定表明 HOTAIR 启动子雌激素反应元件 (ERE) 是由 BPA 和 DES 诱导的。雌激素受体 (ER) 和 ER 辅助调节因子,例如 MLL 组蛋白甲基化酶(MLL1 和 MLL3),在 BPA 和 DES 存在的情况下与 HOTAIR 启动子 ERE 结合,修饰染色质(组蛋白甲基化和乙酰化)并导致基因激活。 ER 的敲低下调了 BPA 和 DES 诱导的 HOTAIR 表达。总之,我们的结果表明,BPA 和 DES 暴露改变了 HOTAIR 启动子的表观遗传编程,导致其在体外和体内的内分泌干扰。
Antisense transcript, long non-coding RNA HOTAIR is a key player in gene silencing and breast cancer and is transcriptionally regulated by estradiol. Here, we have investigated if HOTAIR expression is misregulated by bisphenol-A (BPA) and diethylstilbestrol (DES). Our findings demonstrate BPA and DES induce HOTAIR expression in cultured human breast cancer cells (MCF7) as well as in vivo in the mammary glands of rat. Luciferase assay showed that HOTAIR promoter estrogen-response-elements (EREs) are induced by BPA and DES. Estrogen-receptors (ERs) and ER-coregulators such as MLL-histone methylases (MLL1 and MLL3) bind to the HOTAIR promoter EREs in the presence of BPA and DES, modify chromatin (histone methylation and acetylation) and lead to gene activation. Knockdown of ERs down-regulated the BPA and DES induced expression of HOTAIR. In summary, our results demonstrate that BPA and DES exposure alters the epigenetic programming of the HOTAIR promoters leading to its endocrine disruption in vitro and in vivo.
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